Multi-time density correlation functions in glass-forming liquids: Probing dynamical heterogeneity and its lifetime

Dynamical Heterogeneity and Jamming in Glass-Forming Liquids†

The relationship between spatially heterogeneous dynamics (SHD) and jamming is studied in a glass-forming binary Lennard-Jones system via molecular dynamics simulations. It has been suggested [Phys. ReV. Lett. 2001, 86, 111]1 that the probability distribution of interparticle forces P(F) develops a peak at the glass transition temperature Tg and that the large force inhomogeneities, responsible...

Time-dependent, four-point density correlation function description of dynamical heterogeneity and decoupling in supercooled liquids

Dynamical heterogeneity and the decoupling of diffusion and relaxation in a supercooled liquid is investigated via a time-dependent, four-point density correlation function. We show that the main contribution to the corresponding generalized susceptibility x4(t) in a molecular dynamics simulation of a Lennard-Jones liquid arises from spatial correlations between temporarily localized ~‘‘caged’’...

Comment on "correlation between dynamic heterogeneity and medium-range order in two-dimensional glass-forming liquids".

Correlation between dynamic heterogeneity and medium-range order in two-dimensional glass-forming liquids.

A glassy state of matter results if crystallization is avoided upon cooling or increasing density. However, the physical factors controlling the ease of vitrification and nature of the glass transition remain elusive. Using numerical simulations of polydisperse hard disks, we find a direct relation between medium-range crystalline ordering and the slow dynamics which characterizes the glass tra...

Short time dynamics of glass-forming liquids

Calculations have been presented for the intermediate scattering function, dynamic structure factor, and dynamic susceptibility of a complex correlated system undergoing relaxation with independent vibrations. The vibrational contribution was approximated by a Debye spectrum, smoothed at high frequency, while the coupling model was used to describe the relaxation. This model asserts for nonpoly...